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Title: Spin dynamics near a putative antiferromagnetic quantum critical point in Cu-substituted BaFe 2 As 2 and its relation to high-temperature superconductivity

We present the results of elastic and inelastic neutron scattering measurements on nonsuperconducting Ba(Fe 0.957Cu 0.043) 2As 2, a composition close to a quantum critical point between antiferromagnetic (AFM) ordered and paramagnetic phases. By comparing these results with the spin fluctuations in the low-Cu composition as well as the parent compound BaFe 2As 2 and superconducting Ba(Fe 1–xNi x) 2As 2 compounds, we demonstrate that paramagnon-like spin fluctuations are evident in the antiferromagnetically ordered state of Ba(Fe 0.957Cu 0.043) 2As 2, which is distinct from the AFM-like spin fluctuations in the superconducting compounds. Our observations suggest that Cu substitution decouples the interaction between quasiparticles and the spin fluctuations. In addition, we show that the spin-spin correlation length ξ(T) increases rapidly as the temperature is lowered and find ω/T scaling behavior, the hallmark of quantum criticality, at an antiferromagnetic quantum critical point.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [5] ;  [5] ;  [5] ;  [5] ;  [6] ;  [3] ;  [3] ;  [1] ;  [3] ;  [7] ;  [3] ;  [3] ;  [8]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
  2. Univ. of California, Berkeley, CA (United States). Dept. of Physics
  3. Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy; Ames Lab., Ames, IA (United States)
  4. Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  6. Univ. of Missouri, Columbia, MO (United States). The Missouri Research Reactor
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics
  8. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics and Dept. of Materials Science and Engineering
Publication Date:
Report Number(s):
IS-J-8817
Journal ID: ISSN 1098-0121; PRBMDO
Grant/Contract Number:
AC05-00OR22725; AC02-05CH11231; AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 21; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1234514
Alternate Identifier(s):
OSTI ID: 1227748; OSTI ID: 1311256; OSTI ID: 1454443

Kim, M. G., Wang, M., Tucker, G. S., Valdivia, P. N., Abernathy, D. L., Chi, Songxue, Christianson, A. D., Aczel, A. A., Hong, T., Heitmann, T. W., Ran, S., Canfield, P. C., Bourret-Courchesne, E. D., Kreyssig, A., Lee, D. H., Goldman, A. I., McQueeney, R. J., and Birgeneau, R. J.. Spin dynamics near a putative antiferromagnetic quantum critical point in Cu-substituted BaFe2As2 and its relation to high-temperature superconductivity. United States: N. p., Web. doi:10.1103/PhysRevB.92.214404.
Kim, M. G., Wang, M., Tucker, G. S., Valdivia, P. N., Abernathy, D. L., Chi, Songxue, Christianson, A. D., Aczel, A. A., Hong, T., Heitmann, T. W., Ran, S., Canfield, P. C., Bourret-Courchesne, E. D., Kreyssig, A., Lee, D. H., Goldman, A. I., McQueeney, R. J., & Birgeneau, R. J.. Spin dynamics near a putative antiferromagnetic quantum critical point in Cu-substituted BaFe2As2 and its relation to high-temperature superconductivity. United States. doi:10.1103/PhysRevB.92.214404.
Kim, M. G., Wang, M., Tucker, G. S., Valdivia, P. N., Abernathy, D. L., Chi, Songxue, Christianson, A. D., Aczel, A. A., Hong, T., Heitmann, T. W., Ran, S., Canfield, P. C., Bourret-Courchesne, E. D., Kreyssig, A., Lee, D. H., Goldman, A. I., McQueeney, R. J., and Birgeneau, R. J.. 2015. "Spin dynamics near a putative antiferromagnetic quantum critical point in Cu-substituted BaFe2As2 and its relation to high-temperature superconductivity". United States. doi:10.1103/PhysRevB.92.214404. https://www.osti.gov/servlets/purl/1234514.
@article{osti_1234514,
title = {Spin dynamics near a putative antiferromagnetic quantum critical point in Cu-substituted BaFe2As2 and its relation to high-temperature superconductivity},
author = {Kim, M. G. and Wang, M. and Tucker, G. S. and Valdivia, P. N. and Abernathy, D. L. and Chi, Songxue and Christianson, A. D. and Aczel, A. A. and Hong, T. and Heitmann, T. W. and Ran, S. and Canfield, P. C. and Bourret-Courchesne, E. D. and Kreyssig, A. and Lee, D. H. and Goldman, A. I. and McQueeney, R. J. and Birgeneau, R. J.},
abstractNote = {We present the results of elastic and inelastic neutron scattering measurements on nonsuperconducting Ba(Fe0.957Cu0.043)2As2, a composition close to a quantum critical point between antiferromagnetic (AFM) ordered and paramagnetic phases. By comparing these results with the spin fluctuations in the low-Cu composition as well as the parent compound BaFe2As2 and superconducting Ba(Fe1–xNix)2As2 compounds, we demonstrate that paramagnon-like spin fluctuations are evident in the antiferromagnetically ordered state of Ba(Fe0.957Cu0.043)2As2, which is distinct from the AFM-like spin fluctuations in the superconducting compounds. Our observations suggest that Cu substitution decouples the interaction between quasiparticles and the spin fluctuations. In addition, we show that the spin-spin correlation length ξ(T) increases rapidly as the temperature is lowered and find ω/T scaling behavior, the hallmark of quantum criticality, at an antiferromagnetic quantum critical point.},
doi = {10.1103/PhysRevB.92.214404},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 21,
volume = 92,
place = {United States},
year = {2015},
month = {12}
}